Vienna, work in progress

I'm working on an illustration for a music magazine, the theme being Vienna a city I unfortunately haven't visited. The closest to Vienna I've been is when I saw the third man. Any suggestions of buildings I shouldn't miss are welcome, I've got a lot of space left as you can see. Please, if you got an urge for change try to use my poll on the left here, and see if there's a change on the blog) And Jason got a rather interesting post on his blog today, you know how utterly puritan we Swedes are, I blame Luther.